I exercise 5 days a week for 60 to 75 minutes (spinning class and then resistance training). I am 50. The last three years my creatinine level is slightly high and eGFRis slightly low. When I work out, I always sweat a lot and the smell is ammonia like. My blood pressure is normal; always less than 120/80.
You can have albumin in your urine as long as it is below 30. My albumin was 2. Doctor said I was fine. Normal creatinine range is .8 to 1.4. Mine came back at 1.35. It increased from 1.2(lowest level was 1.12). My eGFR went from 93 to 75. I did change my workout schedule. I started working out 7 days a week. I increased the intensity of the workout and I started to consume more protein. I gained more muscle mass. High intensity exercise and heavy weight lifting do affect your creatinine and apparently, your eGFR. My numbers are still in the normal range, but I will go for a checkup in 4 months.
I have a similar situation. I am also 50 with normal blood pressure and weight. I had a routine physical exam during training for a half marathon (not an elite runner by any stretch) and they referred me to a nephrologist because my serum creatinine was above 1.0 giving me a GFR in the 50s. When I anxiously went to the nephrologist he laughed and said that the test is not very informative for an active female. The key was that I didn’t have any albumin in my urine and also had high urine creatinine. We are just producing more muscle waste and are chronically dehydrated from exercise. My opinion is that as long as you don’t have albumin in your urine, you are fine. Keep up the great exercise routine, and drink lots of water.
While at stage 4 my eGFr was steady at 20% with creatinine at 300+, with very little exercise.
I started swimming again, at first just slowly about 500 meters and increased it by 500 meters every second week
I now swim 3.5km most days.
Since I’ve started swimming my eGFr dropped to 10% and creatinine is hovering about 500 which puts me at stage 5 but still not on dialysis and no sign of me starting it yet.
So to answer your question; Hell yes!!! It certainly has effected my eGFr analysis
I agree that seeing your doctor would be a good idea here. Many issues could be playing a part outside of your exercise routine, including but not limited to kidney problems or problems stemming from diabetes.
If your doctor sees no other issues at play here then you may need to take into account your nutrition component- are you eating a high-protein diet? If so, the ammonia-like smell may be caused by burning amino acids instead of sugars during your aerobic exercise. Breaking down protein as a fuel source leaves a by-product of excess nitrogen in the bloodstream which is translated into ammonia in the urine. Dehydration could also be a potential cause of these issues.
Over-exercising is the other possibility that comes to mind (which means damaged muscles). Remember that the American College of Sports Medicine recommends strength training the same muscle group up to 3 times per week. If your 5 day per week regimen includes the same strength training exercises every day you may want to skip the resistance training for 2 of them or mix up the muscle groups you’re working.
You and your doctor should discuss all possibilities and see if there’s any need for further interventions or tests. Also, strictly out of curiosity, are you a diabetic and were these changes to blood levels of creatinine? (Don’t answer if you’re not comfortable with that information being made public.) Please keep us posted if you determine the cause of the change or a solution!